Merck Patent Gmbh

Merck Patent Gesellschaft MIT Beschrankter Haftung

Masahiko Yazawa

Tamio Noguchi

Yukitaka Watanabe

Kaiman Shimizu

Fumiko Sasaki

The present invention is related to magnetic pigments comprising a transparent flaky homogeneously composed substrate having two parallel major surfaces and a coating comprising a layered structure composed of a hematite and a magnetite layer, to a process for the production of said pigments as well as to their use.

Magnetic pigments

Magnetic pigments containing a transparent flaky homogeneously composed substrate having two parallel major surfaces and a coating containing maghemite, a process for the production of said pigments as well as their use.

Magnetic pigments comprising a flaky substrate and layer of maghemite

The invention provides a flaky pigment comprising particles of a flaky substrate and particles of a pigment or dye, whereby said flaky pigment is in the form of an ordered mixture. The invention also involves preparation of the pigment by a process comprising subjecting said substrate and said pigment or dye to high speed stirring in the absence of a liquid medium.

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Iwaki, Japan

Masahiko Yazawa